Adding a dropdown menu in Prestashop 1.7 module

I’m so beginner in Prestashop 1.7, I wanted to add a dropdown select section in my banner module to select the way to open the banner link.

but the selected value is never passed to the HTML, the code below IS passed but the one under isn’t, can you please assist me?
[enter image description here][1]

array(
                        'type' => 'text',
                        'lang' => true,
                        'label' => $this->trans('Banner description', array(), 'Modules.Banner.Admin'),
                        'name' => 'BANNER_DESC',
                        'desc' => $this->trans('Please enter a short but meaningful description for the banner.', array(), 'Modules.Banner.Admin')
                    )

array(
                        'type' => 'select', //select
                        'lang' => true,
                        'label' => $this->trans('Banner tab', array(), 'Modules.Banner.Admin'),
                        'name' => 'BANNER_TAB',
                        'required'=>'true',
                        'options' => array(
                            'query' => array(
                                array('key' => '_blank', 'name' => 'New tab'),
                                array('key' => '_self', 'name' => 'Same tab'),
                            ),
                            'id' => 'key',
                            'name' => 'name'
                        ),
                        
                        'desc' => $this->trans('Please select the way to open the link.', array(), 'Modules.Banner.Admin')
                    )

This is how it looks in the Backoffice:
Here